Verification method of osteotomy guide tool, verification system and detection element

ABSTRACT

A detection element and a verification system are disclosed. The detection element includes a detection end for contacting a feature portion of the osteotomy guide tool; and a positioning target connected to the detection end and configured to provide a pose parameter of the feature portion of the osteotomy guide tool in a coordinate system of a trackable element. With this configuration, the osteotomy guide tool can be verified to avoid deformation of the osteotomy guide tool during repeated use or transportation, affecting its positioning accuracy and affecting the operation.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/861,677, filed Apr. 29, 2020, which in turn claims the priority ofChinese patent application number 201911157719.5, filed on Nov. 22,2019, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to the field of robot-assisted surgicalsystems and methods, and in particular, to a verification system and adetection element.

BACKGROUND

In artificial joint replacement surgeries, various positioners, guidesand other tools are used in an osteotomy process before installation ofthe artificial joint to ensure the accuracy of the osteotomy. Differentapproaches have been proposed to assist surgeons to achieve positioningof the osteotomy guide tools during total knee joint replacement (TKR)surgery. Generally, in the existing robot-assisted surgical system, anosteotomy guide tool is provided at the end of the robotic arm, and therobotic arm controls the guide motion of the osteotomy guide tool torealize the positioning of the osteotomy guide tool during the kneereplacement surgery. During registration of the robotic arm, both therobotic arm system and the positioning system need to obtain thegeometric center point of the osteotomy guide tool. Only when thegeometric center point of the guide tool obtained by the robotic armsystem and the geometric center point of the guide tool obtained by thepositioning system are coincide or the same point, the conversion matrixobtained by the registration of the robotic arm can be correct. When theosteotomy guide tool is deformed, the positioning system cannotrecognize the deformation, which will affect the positioning accuracy ofthe operation and thus affect the operation result.

SUMMARY OF THE INVENTION

In view of the above, an objective of the present disclosure is toprovide a verification method of an osteotomy guide tool, a verificationsystem and a detection element, to solve the problem that the existingrobot-assisted surgical system cannot identify the deformation of theosteotomy guide tool.

In one aspect, the present disclosure provides a verification method ofan osteotomy guide tool, including:

obtaining a pose parameter of a feature portion of an osteotomy guidetool in a coordinate system of a trackable element; and

comparing the obtained pose parameter of the feature portion of theosteotomy guide tool with a corresponding standard value to obtain anoffset between the pose parameter of the feature portion of theosteotomy guide tool and the standard value;

wherein if the offset is greater than an expected value, the osteotomyguide tool is determined as deformed.

Optionally, in the verification method of an osteotomy guide tool, thefeature portion includes a geometric center point of an osteotomy guideblock of the osteotomy guide tool, and wherein the step of obtaining apose parameter of a feature portion of an osteotomy guide tool in acoordinate system of a trackable element includes:

obtaining a plurality of pose parameters of a plurality of surfaces ofthe osteotomy guide block of the osteotomy guide tool in the coordinatesystem of the trackable element;

calculating an intermediate plane between every two opposite surfaces ofthe plurality surfaces according to the plurality of pose parameters ofthe plurality of surfaces; and

determining an intersection point defined by the intersectingintermediate planes as the geometric center point of the osteotomy guideblock, and calculating a pose parameter of the geometric center point ofthe osteotomy guide block in the coordinate system of the trackableelement.

Optionally, in the verification method of an osteotomy guide tool, thestep of obtaining a plurality of pose parameters of a plurality ofsurfaces of the osteotomy guide block of the osteotomy guide tool in thecoordinate system of the trackable element includes:

acquiring pose parameters of a plurality of feature points or featurelines on each surface of the osteotomy guide block by using a detectionelement; and

determining the pose parameter of each surface according to the poseparameters of the plurality of feature points or feature lines on theeach surface.

Optionally, in the verification method of an osteotomy guide tool, inthe acquired plurality of feature points on each surface, at least threefeature points of the plurality of feature points on each surface arenot collinear or the feature lines on each surface are curved lines.

Optionally, in the verification method of an osteotomy guide tool, thefeature portion includes an inner surface of a guiding groove and/or aguiding hole of an osteotomy guide block of the osteotomy guide tool,wherein the step of obtaining a pose parameter of a feature portion ofan osteotomy guide tool in a coordinate system of a trackable elementincludes:

obtaining a pose parameter of the inner surface of the guiding grooveand/or the guiding hole of the osteotomy guide block in the coordinatesystem of the trackable element according to a detection element whosedetection end is inserted into the guiding groove and/or the guidinghole of the osteotomy guide block.

Optionally, in the verification method of an osteotomy guide tool, thefeature portion includes the guiding groove of the osteotomy guideblock, and wherein the step of obtaining a pose parameter of a featureportion of an osteotomy guide tool in a coordinate system of a trackableelement includes, after the detection end of the detection element isinserted into the guiding groove: acquiring an information about asliding of the detection end of the detection element in the guidinggroove along an extending direction of the guiding groove.

Optionally, in the verification method of an osteotomy guide tool, thestep of acquiring an information about a sliding of the detection end ofthe detection element in the guiding groove along an extending directionof the guiding groove includes: acquiring an information about a slidingof the detection end of the detection element along each of two openends of the guiding groove to obtain a pose parameter of the innersurface of the guiding groove corresponding to each of the two openends.

Optionally, in the verification method of an osteotomy guide tool, awidth of the detection end of the detection element matches with a widthof the guiding groove, and wherein the step of acquiring an informationabout a sliding of the detection end of the detection element in theguiding groove along an extending direction of the guiding grooveincludes: acquiring an information about a single sliding of thedetection end of the detection element along the extending direction ofeach guiding groove to obtain a pose parameter of the inner surface ofthe guiding groove.

Optionally, in the verification method of an osteotomy guide tool, thestep of comparing the obtained pose parameter of the feature portion ofthe osteotomy guide tool with a corresponding standard value includes:determining whether pose parameters of the inner surface of the guidinggroove corresponding to two open ends thereof are in a same plane;wherein

if not, the guiding groove is determined as deformed; or

if so, comparing the pose parameters of the inner surface of the guidinggroove corresponding to the two open ends with a standard value of theguiding groove.

Optionally, in the verification method of an osteotomy guide tool, theosteotomy guide tool is configured to be disposed at an end of a roboticarm, wherein the feature portion includes a geometric center point of anosteotomy guide block of the osteotomy guide tool, and wherein the stepof obtaining a pose parameter of a feature portion of an osteotomy guidetool in a coordinate system of a trackable element includes:

driving the osteotomy guide tool by the robotic arm to rotate around apreset geometric center point of the osteotomy guide block; and

calculating a pose parameter of the geometric center point of theosteotomy guide block in the coordinate system of the trackable elementbased on a point cloud information formed by the trackable elementconnected to the osteotomy guide tool during rotation.

Optionally, in the verification method of an osteotomy guide tool,during driving the osteotomy guide tool by the robotic arm to rotatearound the preset geometric center point of the osteotomy guide block,connection points between the robotic arm and the osteotomy guide toolare taken as movement points, wherein the movement points each follows acircular movement around a movement center in a movement plane, whereinan angle between: i) a movement line defined by connecting any one ofthe movement points and the preset geometric center point and ii) acenter line defined by connecting the movement center and the presetgeometric center point is not smaller than 30°.

In another aspect, the present disclosure provides a detection elementfor verifying an osteotomy guide tool, including:

a detection end for contacting a feature portion of the osteotomy guidetool; and

a positioning target connected to the detection end and configured toprovide a pose parameter of the feature portion of the osteotomy guidetool in a coordinate system of a trackable element.

Optionally, in the detection element, the detection end includes a sharpportion for abutting the feature portion of the osteotomy guide tool.

Optionally, in the detection element, the detection end includes aplunger having a width matching with a width of a guiding groove of anosteotomy guide block of the osteotomy guide tool, and wherein theplunger is configured to be inserted into the guiding groove.

Optionally, in the detection element, the detection end includes a sheetportion having a length matching with a length of a guiding groove of anosteotomy guide block of the osteotomy guide tool and/or a pin having anouter dimension matching with an inner dimension of a guiding hole ofthe osteotomy guide block of the osteotomy guide tool.

Optionally, in the detection element, the detection end is detachablyconnected to the positioning target.

In still another aspect, the present disclosure provides a verificationsystem, including:

an osteotomy guide tool, including an osteotomy guide block and a targetmounting portion connected with the osteotomy guide block;

a detection element for verifying the osteotomy guide tool, including: adetection end for contacting a feature portion of the osteotomy guidetool; and a positioning target connected to the detection end andconfigured to provide a pose parameter of the feature portion of theosteotomy guide tool in a coordinate system of a trackable element;

the trackable element provided on the target mounting portion;

a navigation device configured to communicate with the trackable elementand the detection element, thereby obtaining a pose parameter of thetrackable element and the detection element by the positioning target;and

a control device in communication with the navigation device;

wherein the detection end of the detection element is configured tocontact the feature portion of the osteotomy guide tool, wherein thecontrol device is configured to obtain the pose parameter of the featureportion in the coordinate system of the trackable element by thenavigation device and the detection element, and wherein if an offsetbetween the obtained pose parameter and a corresponding standard valueis greater than an expected value, the osteotomy guide tool isdetermined as deformed.

Optionally, in the verification system, the detection end of thedetection element includes a sharp portion for abutting the featureportion of the osteotomy guide tool.

Optionally, in the verification system, the detection end of thedetection element includes a plunger having a width matching with awidth of a guiding groove of an osteotomy guide block of the osteotomyguide tool, and wherein the plunger is configured to be inserted intothe guiding groove.

Optionally, in the verification system, the detection end of thedetection element includes a sheet portion having a length matching witha length of a guiding groove of an osteotomy guide block of theosteotomy guide tool and/or a pin having an outer dimension matchingwith an inner dimension of a guiding hole of the osteotomy guide blockof the osteotomy guide tool.

In summary, the verification method of the osteotomy guide tool, theverification system and the detection element provided in the presentdisclosure relate: first obtaining a pose parameter of a feature portionof an osteotomy guide tool in a coordinate system of a trackableelement; then comparing the obtained pose parameter of the featureportion of the osteotomy guide tool with a corresponding standard valueto obtain an offset between the pose parameter of the feature portion ofthe osteotomy guide tool and the standard value; if the offset isgreater than an expected value, the osteotomy guide tool is determinedas deformed. With this configuration, the osteotomy guide tool can beverified to avoid deformation of the osteotomy guide tool duringrepeated use or transportation, affecting its positioning accuracy andaffecting the operation.

BRIEF DESCRIPTION OF DRAWINGS

The implementation method of the present disclosure and the features,properties, and advantages of the related embodiments will be describedby referring to the following drawings, in which:

FIG. 1 is a schematic diagram of knee joint replacement using anorthopedic surgical system according to Embodiment 1 of the presentdisclosure;

FIG. 2 is a schematic structural diagram of an osteotomy guide toolaccording to Embodiment 1 of the present disclosure;

FIG. 3 is a cross-sectional view taken along line AA of the osteotomyguide tool shown in FIG. 2;

FIG. 4 is a schematic diagram of a verification system for an osteotomyguide tool according to a first example of Embodiment 1 of the presentdisclosure;

FIG. 5 is a schematic diagram of obtaining the geometric center point ofan osteotomy guide block according to Embodiment 1 of the presentdisclosure;

FIG. 6 is schematic diagram of a verification system for an osteotomyguide tool according to a second example of Embodiment 1 of the presentdisclosure;

FIG. 7 is schematic diagram of a verification system for an osteotomyguide tool according to a first example of Embodiment 2 of the presentdisclosure;

FIG. 8 is schematic diagram of another verification system for anosteotomy guide tool according to a second example of Embodiment 2 ofthe present disclosure;

FIG. 9 is schematic diagram of still another verification system for anosteotomy guide tool according to a third example of Embodiment 2 of thepresent disclosure;

FIG. 10 is schematic diagram of the verification system for an osteotomyguide tool according to a fourth example of Embodiment 2 of the presentdisclosure;

FIG. 11 is schematic diagram of the verification system for an osteotomyguide tool according to a fifth example of Embodiment 2 of the presentdisclosure;

FIG. 12 is schematic diagram of the verification system for an osteotomyguide tool according to a sixth example of Embodiment 2 of the presentdisclosure;

FIG. 13 is a schematic diagram of the verification system for anosteotomy guide tool according to a seventh example of Embodiment 2 ofthe present disclosure;

FIG. 14 is a structural schematic of a verification system for anosteotomy guide tool according to Embodiment 3 of the presentdisclosure.

In these drawings:

-   -   1—surgical trolley; 2—robotic arm; 3—trackable element;        4—osteotomy guide tool; 5—swing saw; 6—NDI navigation device;        7—auxiliary display; 8—main display; 9—navigation trolley        10—keyboard; 11—femoral target; 12—femoral; 13—tibial target;        14—tibial; 15—basal target; 17—patient; 18—operator; 30—target        mounting portion; 40—osteotomy guide block; 41—guiding groove;        42—guiding hole; 405—right leg pulley-osteotomy groove; 407,        411—0° guiding groove; 408, 410—45° guiding groove; 412—left leg        pulley-osteotomy groove;    -   100—detection element; 101—detection end; 102—positioning        target.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

The above and other objectives, features and advantages of the presentdisclosure will become more apparent from the following detaileddescription of the proposed surgical robot system, which is to be readin connection with FIGS. 1 to 14. Note that the figures are muchsimplified and may not be drawn to scale, and the sole purpose of themis to facilitate easy and clear explanation of the disclosedembodiments. In addition, the structure shown in the figures is oftenpart of the actual structure. In particular, the figures show differentemphases, and often adopt different proportions.

As used in the present disclosure, the singular forms “a”, “an” and“the” include plural referents unless the content clearly dictatesotherwise. As used in the present disclosure, the term “or” is generallyused in its sense including “and/or” unless the content clearly dictatesotherwise. As used in the present disclosure, the term “several” isgenerally used in its sense including “at least one” unless the contentclearly indicates otherwise. As used in the present disclosure, the term“at least two” is generally used in its sense including “two or more”unless the content clearly indicates otherwise. In addition, the terms“first”, “second” and “third” are used for descriptive purposes only,and cannot be understood as indicating or implying relative importanceor implicitly indicating the number of technical features indicated.Therefore, the features defined as “first”, “second” and “third” mayexplicitly or implicitly include one or at least two of the features.

The present disclosure is to provide a verification method of anosteotomy guide tool, a verification system and a detection element, tosolve the problem that the existing robot-assisted surgical systemcannot identify the deformation of the osteotomy guide tool.

The verification method of an osteotomy guide tool includes: obtaining apose parameter of a feature portion of an osteotomy guide tool in acoordinate system of a trackable element; and comparing the obtainedpose parameter of the feature portion of the osteotomy guide tool with acorresponding standard value to obtain an offset between the poseparameter of the feature portion of the osteotomy guide tool and thestandard value; wherein if the offset is greater than an expected value,the osteotomy guide tool is determined as deformed.

With this configuration, the osteotomy guide tool can be verified toavoid inaccurate positioning caused by deformation of the osteotomyguide tool during repeated use or transportation, and thereby ensuringaccuracy and safety of the operation.

The following description is made with reference to the drawings.

Embodiment 1

Please refer to FIGS. 1 to 6, where FIG. 1 is a schematic diagram ofknee joint replacement using an orthopedic surgical system according toEmbodiment 1 of the present disclosure. FIG. 2 is a schematic structuraldiagram of an osteotomy guide tool according to Embodiment 1 of thepresent disclosure. FIG. 3 is a cross-sectional view taken along line AAof the osteotomy guide tool shown in FIG. 2. FIG. 4 is a schematicdiagram of a verification system for an osteotomy guide tool accordingto a first example of Embodiment 1 of the present disclosure. FIG. 5 isa schematic diagram of obtaining the geometric center point of anosteotomy guide block according to Embodiment 1 of the presentdisclosure. FIG. 6 is schematic diagram of a verification system for anosteotomy guide tool according to a second example of Embodiment 1 ofthe present disclosure.

Embodiment 1 of the present disclosure provides an orthopedic surgicalsystem. FIG. 1 is a schematic diagram of knee joint replacement usingthe orthopedic surgical system. However, the orthopedic surgical systemof the present disclosure has no particular limitation on theapplication environment and can also be applied to other orthopedicsurgeries. In the following description, an orthopedic surgical systemis described using knee replacement as an example, but it should not betaken as a limitation of the present disclosure.

As shown in FIG. 1, the orthopedic surgical system includes a controldevice, a navigation device, a robotic arm 2 and an osteotomy guide tool4. The control device is configured as a computer which is equipped witha controller, a main display 8 and a keyboard 10, and more preferablythe computer is further equipped with an auxiliary display 7. In thisembodiment, the contents displayed on the auxiliary display 7 and thecontents displayed on the main display 8 are the same, for example, bothare used to display osteotomy position images. The navigation device isan electromagnetic positioning navigation device, an optical positioningnavigation device, or an electromagnetic positioning navigation device.In some embodiments, the navigation device is an optical positioningnavigation device. Compared with other navigation methods, themeasurement accuracy of the optical positioning navigation is higher,which can effectively improve the positioning accuracy of the osteotomyguide tool. In the following description, the optical positioningnavigation device is taken as an example for description, but it is notlimited herein.

The navigation device specifically includes a navigation marker and atracker 6. The navigation marker includes a basal target 15 and atrackable element 3. The basal target 15 is fixed, for example, thebasal target 15 is fixed on the surgical trolley 1 such that a basecoordinate system (also referred to as a basal target coordinate system)is established. The trackable element 3 is mounted on the osteotomyguide tool 4 to track the position of the osteotomy guide tool 4. Theosteotomy guide tool 4 is mounted at the end of the robotic arm 2 sothat the osteotomy guide tool 4 is supported by the robotic arm 2 andthe spatial position and the posture of the osteotomy guide tool 4 areadjusted by the robotic arm 2.

In practice, the tracker 6 is configured to capture the signal(preferably an optical signal) reflected by the trackable element 3 andrecord the position of the trackable element 3 (that is, the positionand the posture of the trackable element under the base coordinatesystem). Then the instruction stored in the controller controls themovement of the robotic arm 2 according to the current position and thedesired position of the trackable element. The robotic arm 2 drives theosteotomy guide tool 4 and the trackable element 3 to move, until thetrackable element 3 is moved to the desired position. The expectedposition of the trackable element 3 corresponds to the desired positionof the osteotomy guide tool 4.

Therefore, the application of the orthopedic surgical system can realizethe automatic positioning of the osteotomy guide tool 4, and thetrackable element 3 tracks and feeds back the real-time pose of theosteotomy guide tool 4 during the operation. The adjustment of theposition and pose of the osteotomy guide tool is achieved by controllingthe movement of the robotic arm. This not only ensures a highpositioning accuracy of the osteotomy guide tool 4, but also preventssecondary injury to the human body, as the osteotomy guide tool 4 issupported by the robotic arm 2 and need not be fixed on the human body.

Generally, the orthopedic surgical system further includes a surgicaltrolley 1 and a navigation trolley 9. The control device and a part ofthe navigation device are mounted on the navigation trolley 9, forexample, the controller is mounted inside the navigation trolley 9, andthe keyboard 10 is placed outside the navigation trolley 9 foroperation. The main display 8, the auxiliary display 7 and the tracker 6are all mounted on a bracket, the bracket is vertically fixed on thenavigation trolley 9, and the robotic arm 2 is mounted on the surgicaltrolley 1. The use of the surgical trolley 1 and the navigation trolley9 eases the entire surgical operation. In some embodiments, thecontroller is mounted in the surgical trolley 1.

When performing knee joint replacement surgery, the use of theorthopedic surgical system of this embodiment generally includes thefollowing operations:

first, moving the surgical trolley 1 and the navigation trolley 9 toappropriate positions next to the hospital bed;

then, providing the navigation markers (the navigation markers alsoinclude femoral target 11 and tibial target 13), the osteotomy guidetool 4 and other relevant components (such as sterile bags);

after that, the surgeon 18 imports the CT/MR scan model of the bone ofthe patient 17 into the computer for preoperative planning to obtain anosteotomy scheme. The osteotomy scheme includes, for example, theosteotomy scheme coordinates, the model of the prosthesis, and theinstallation orientation of the prosthesis. Specifically, based on thepatient knee image data obtained from CT/MR scans, an osteotomy schemeis created based on the three-dimensional digital model of the kneejoint, so that the surgeon can perform preoperative evaluation accordingto the osteotomy scheme. Specifically, the osteotomy scheme isdetermined based on the three-dimensional digital model of the kneejoint in combination with size specifications of the obtained prosthesisand installation position of the osteotomy plate. The osteotomy schemeis finally output in the form of a surgical report, which records aseries of reference data such as the coordinates of the osteotomy plane,the amount of osteotomy, the angle of the osteotomy, the size of theprosthesis, the installation position of the prosthesis, and thesurgical aids/assisting tools, especially a series of theoreticalexplanations, such as the reason for selecting the osteotomy angle areprovided as a reference for the surgeon. The three-dimensional digitalmodel of the knee joint can be displayed on the main display 8 and thesurgeon can enter surgical parameters via the keyboard 10 forpreoperative planning.

After the preoperative evaluation, the surgeon 18 then uses a target penor a pole with tracking elements to mark the guiding features on thepatient's femur and tibia (that is, the surgeon marks multiple femoralanatomical guiding features on the patient's femoral entity and multipletibial anatomical guiding features on the patient's tibial entity). Thenavigation device takes the basal target 15 as a reference, records thepositions of all guiding features on the patient's tibia 14 and femur12, and sends the position information of all guiding features to thecontroller, and then the controller obtains the actual orientations ofthe femur 12 and the tibia 14 by means of the feature matchingalgorithm, and corresponds the orientations to those of the femur 12 andthe tibia 14 shown in the CT/MR images.

Subsequently, the actual orientations of the femur and the tibia arelinked to the corresponding targets mounted on the femur and the tibiaby the navigation device, so that the femoral target 11 and the tibiatarget 13 can track the current position of the bone in real time. Therelative position between the target and the bone is fixed, the bonemovement will not affect the surgical effect.

Further, the coordinate of the osteotomy scheme planned before theoperation is sent to the robotic arm 2 by the navigation device. Afterthe robotic arm 2 locates the osteotomy scheme through the trackableelement 3 and moves to the predetermined position, the robotic arm 2 isin the holding state (that is, the robotic arm 2 does not move). Afterthat, the surgeon/operator can use the surgical tool 5 such as apendulum saw or an electric drill to perform osteotomy and/or drillingoperations by the osteotomy guide tool 4. After the osteotomy anddrilling operations are completed, the surgeon can install theprosthesis and perform other surgical operations.

In this embodiment, the navigation marker further includes a femurtarget 11 and a tibial target 13. The femoral target 11 is configured tolocate/track the spatial position and the posture of the femur 12, andthe tibial target 13 is configured to locate/track the spatial positionand the posture of the tibia 14. As mentioned before, the trackableelement 3 is mounted on the osteotomy guide tool 4, but in otherembodiments, the trackable element 3 is alternatively mounted on the endjoint of the robotic arm 2.

Based on the above orthopedic surgical system, robot-assisted surgerycan be realized to assist the surgeon/operator locate the desiredposition for osteotomy and perform the osteotomy. Please refer to FIG. 2and FIG. 3, which illustrate an osteotomy guide tool 4 provided in thisembodiment. The osteotomy guide tool 4 includes an osteotomy guide block40 and a target mounting portion 30. The target mounting portion 30 isconfigured for connection of the trackable element 3. The osteotomyguide block 40 is provided with guiding features. The guiding featuresinclude a guiding groove 41 or a guiding hole 42, or a combination of aguiding groove 41 and a guiding hole 42. That is, the guiding featureson the osteotomy guide block 40 may be one or more combinations of theguiding groove 41 and the guiding hole 42, thereby providing one or moreguides for osteotomy of knee replacement, specifically providing guidesfor osteotomy and drilling operations of the distal femur, the front ofthe femur, the back of the femur, the oblique of the front of the femur,the oblique of the back of the femur, the pulley groove, the femoralprosthesis mounting hole, the tibial plateau, and the tibial keeltreatment locating hole, so that the same osteotomy guide tool canperform multiple operations of osteotomy and drilling. In practice, theposition of the osteotomy guide tool 4 is represented by the position ofthe trackable element 3. It is also necessary to calibrate the posturemapping/corresponding relationship between the trackable element 3 andthe osteotomy guide tool 4 in advance, such as according to the positioninformation of the guiding feature relative to the center point of theosteotomy guide block 40 and the coordinate information (or the poseparameter) of the center point of the osteotomy guide block 40 in thecoordinate system of the trackable element, obtaining the pose parameter(including position and the posture) of the guiding feature in thecoordinate system of the trackable element, thereby forming apose-parameter mapping relationship between the guiding feature and thetrackable element 3.

In order to increase the scope of the prosthesis applicable to theosteotomy guide tool of the present disclosure, as shown in FIG. 2, theguiding groove 41 on the osteotomy guide block 40 is provided with 0°guiding grooves (407 and 411) and 45° guiding grooves (408 and 410),right leg-pulley osteotomy groove 405 and left leg-pulley osteotomygroove 412. When an osteotomy performed to the front of the femur, theoblique of the front of the femur, the back of the femur, and theoblique of the back of the femur, it is enough for the translation ofthe osteotomy guide block 40 to use the corresponding guiding groove tocomplete these osteotomy operations. Thus the trackable element 3 on theosteotomy guide block 40 will not cause/generate a large pose change,thereby reducing the transmission error of the robotic arm 2 and thetarget position tracking error, and improving the positioning accuracy.The shape of the guiding groove 41 is preferably a horn. FIG. 3illustrates a cross section of the 0° guiding groove 411 along itsextending direction. As can be seen, the two open ends (the upper andlower ends in the figure) of the 0° guiding groove 411 are different insize, the 0° guiding groove 411 has a shape of a horn as a whole, so asto increase the swing range of a surgical tool such as a pendulum saw inthe guiding groove, so as to be compatible with osteotomy operations ofmore types of prostheses.

As mentioned above, since the orthopedic surgical system needs to bepositioned based on the pose parameters of the feature portions on theosteotomy guide tool 4 for surgical operation, once the feature portionson the osteotomy guide tool 4 are deformed, in the orthopedic surgicalsystem, the positioning accuracy will be affected because the failure ofrecognition of deformation of the feature portion on the osteotomy guidetool 4. Thus, this embodiment provides a verification method of anosteotomy guide tool which includes:

Step S1: obtaining a pose parameter of a feature portion of an osteotomyguide tool 4 in a coordinate system of a trackable element;

Step S2: comparing the obtained pose parameter of the feature portion ofthe osteotomy guide tool 4 with a corresponding standard value to obtainan offset between the pose parameter of the feature portion of theosteotomy guide tool 4 and the standard value; wherein if the offset isgreater than an expected value, the osteotomy guide tool 4 is determinedas deformed. Verifying of the pose parameters of the feature portions ofthe osteotomy guide tool 4 can avoid the deformation of the osteotomyguide tool 4 during repeated use or transportation, which affects itspositioning accuracy and affects the operation.

Based on the above description, this embodiment provides a detectionelement 100 for verifying an osteotomy guide tool 4. The detectionelement 100 includes: a detection end 101 and a positioning target 102,the detection end 101 is used to contact with the feature portion of theosteotomy guide tool 4, the positioning target 102 and the detection end101 is connected to provide pose parameters of the feature portion ofthe osteotomy guide tool in the coordinate system of the trackableelement. The positioning target 102 may be an optical reflector fortracking and positioning of the navigation device 6, and the navigationdevice 6 sends the positioning information to the control device. Thecontrol device calculates a pose parameter of the feature portion in thecoordinate system of the trackable element, if the offset between thepose parameter of the feature portion and the standard value is greaterthan an expected value, then the osteotomy guide tool 4 is determined asdeformed. Preferably, the detection end 101 includes a sharp portion forabutting the feature portion of the osteotomy guide tool 4.

Preferably, the feature portion includes a geometric center point P ofthe osteotomy guide block 40 of the osteotomy guide tool 4, the step S1includes:

Step SA1: obtaining a plurality of pose parameters of a plurality ofsurfaces of the osteotomy guide block 40 of the osteotomy guide tool 4in the coordinate system of the trackable element;

Step SA2: calculating an intermediate plane between every two oppositesurfaces of the plurality surfaces according to the plurality of poseparameters of the plurality of surfaces; and

Step SA3: determining an intersection point defined by the intersectingintermediate planes as the geometric center point P of the osteotomyguide block 40, and calculating a pose parameter of the geometric centerpoint P of the osteotomy guide block 40 in the coordinate system of thetrackable element.

Please refer to FIG. 4, in the first example of this embodiment, thestep SA1 includes: acquiring pose parameters of a plurality of featurepoints or feature lines on each surface of the osteotomy guide block 40by using a detection element 100; and determining the pose parameter ofeach surface according to the pose parameters of the plurality offeature points or feature lines on each surface.

Specifically, in step SA1, using the sharp portion of the detection end101 of the detection element 100 to acquire a plurality of featurepoints on each surface of the osteotomy guide tool 4, during the processof acquiring the feature points by the detection element 100, thenavigation device 6 detects the trackable element 3 and sends thedetected information to the control device. The control devicecalculates the pose parameter of the feature point in the coordinatesystem of the trackable element based on the detected information.Therefore, the pose parameter of the surface of the osteotomy guideblock 40 in the navigation system is Rt_(W) ^(A), the pose parameter ofthe trackable element 3 in the navigation system is Rt_(W) ^(B), thus,the pose parameter Rt_(B) ^(A)=Rt_(W) ^(A)−Rt_(W) ^(B) of the surface ofthe osteotomy guide block 40 in the coordinate system of the trackableelement can be obtained by the coordinate change.

Preferably, in the acquired plurality of feature points on each surface,at least three feature points of the plurality of feature points on eachsurface are not collinear. Generally, a plane can be determined by threenon-collinear feature points, so in step SA1, it is preferable to obtainthree feature points to determine a surface of the osteotomy guide block40. Of course, those skilled in the art can select more feature pointsaccording to the actual needs, and there will be some redundant featurepoints in the more feature points, which can further improve theaccuracy of the calculated surface.

Please refer to FIG. 5, in step SA2, the intermediate plane betweenevery two opposite surfaces of the plurality surfaces is calculatedaccording to the plurality of pose parameters of the plurality ofsurfaces of the osteotomy guide block 40 measured in step SA1. Since thepose parameters of all surfaces of the osteotomy guide block 40 areobtained, an intermediate plane can be calculated for every two opposingsurfaces. Taking the osteotomy guide block 40 as an example of a cuboid,three intermediate planes can be obtained from six surfaces. Further, instep SA3, the intersection point of the three intermediate planes isdefined as the geometric center point P of the osteotomy guide block 40.Of course, the osteotomy guide block 40 is not limited to a cuboid, andthose skilled in the art can implement the determination of thegeometric center point P of the osteotomy guide block 40 of other shapesaccording to the above descriptions. Since the transformationrelationship of the pose parameter of the surface of the osteotomy guideblock 40 in the coordinate system of the trackable element has beendetermined in the previous step SA1, the pose parameter of the geometriccenter point P in the coordinate system of the trackable element canalso be easily obtained.

Further, in step S2, the standard value is the pose parameter of theexpected center point P′ of the osteotomy guide block 40 determined by athree-coordinate calibration instrument in the coordinate system of thetrackable element. That is, the standard value is the expected centerpoint P′ without any deformation of the osteotomy guide block 40, whichcan be determined by the three-coordinate calibration instrument at thefactory or obtained from the design value of the osteotomy guide tool40. The expected value can be set according to the actual needs. If theoffset is greater than the expected value, it means that the deformationof the osteotomy guide block 40 is large, which can no longer meet theaccuracy requirements of the operation, the osteotomy guide tool 4 isdetermined as deformed, and the operator can replace or perform othertreatments on the deformed osteotomy guide tool 4 according to theactual situation. Further, if the offset is not greater than theexpected value, it means that the deformation of the osteotomy guidetool 4 is small, which can satisfy the accuracy of the operation, theoperator can further choose whether to update the standard value to thepose parameter of the feature portion of the osteotomy guide tool 4actually obtained in step S1, so as to perform the surgical operationmore accurately later.

Please refer to FIG. 6, in the second example of this embodiment, thestep SA1 includes: obtaining the pose parameters of the feature lines oneach surface of the osteotomy guide block 40 by using a detectionelement 100 respectively; determining the pose parameter of each surfaceaccording to the pose parameters of the plurality of feature lines oneach surface. In some embodiments, the feature lines acquired on eachsurface are curved lines. The curve line may have, for example, an “S”shape or the like. In practice, the sharp portion of the detection end101 of the detection element 100 can be slide in an S shape on eachsurface of the osteotomy guide tool 4. Since the feature line is a curveline, a unique plane can be determined, so in step SA1, a surface of theosteotomy guide block 40 can be determined. Of course, those skilled inthe art can select other types of feature lines according to the actualneeds, such as polylines. The remaining method steps of the secondexample of this embodiment and the first example of this embodiment canrefer to the above description.

In the above method, by obtaining the pose parameter of the surface ofthe osteotomy guide block 40, the pose parameter of the geometric centerpoint of the osteotomy guide block 40 can be calculated. Furthermore,the calculated pose parameter of the geometric center point is comparedwith a standard value and an offset is obtained, wherein if the offsetis greater than the expected value, the osteotomy guide tool isdetermined as deformed. With this configuration, the osteotomy guidetool can be verified to avoid deformation of the osteotomy guide toolduring repeated use or transportation, affecting its positioningaccuracy and affecting the operation.

Embodiment 2

Please refer to FIGS. 7 to 13, wherein FIG. 7 is schematic diagram of averification system for an osteotomy guide tool according to a firstexample of Embodiment 2 of the present disclosure. FIG. 8 is schematicdiagram of another verification system for an osteotomy guide toolaccording to a second example of Embodiment 2 of the present disclosure.FIG. 9 is schematic diagram of still another verification system for anosteotomy guide tool according to a third example of Embodiment 2 of thepresent disclosure. FIG. 10 is schematic diagram of the verificationsystem for an osteotomy guide tool according to a fourth example ofEmbodiment 2 of the present disclosure. FIG. 11 is schematic diagram ofthe verification system for an osteotomy guide tool according to a fifthexample of Embodiment 2 of the present disclosure. FIG. 12 is schematicdiagram of the verification system for an osteotomy guide tool accordingto a sixth example of Embodiment 2 of the present disclosure. FIG. 13 isa schematic diagram of the verification system for an osteotomy guidetool according to a seventh example of Embodiment 2 of the presentdisclosure.

The verification method of the osteotomy guide tool, the verificationsystem and the detection element provided by the second embodiment ofthe present disclosure are basically the same as the verification methodof the osteotomy guide tool, the verification system and the detectionelement provided by the first embodiment of the present disclosure. Thesame part will not be described, the following only describes thedifferences.

In this embodiment, the feature portion includes an inner surface of aguiding groove and/or a guiding hole of an osteotomy guide block 40 ofthe osteotomy guide tool 4. The step S1 includes: obtaining a poseparameter of the inner surface of the guiding groove 41 and/or theguiding hole 42 of the osteotomy guide block 40 in the coordinate systemof the trackable element according to a detection element 100 whosedetection end is inserted into the guiding groove 41 and/or the guidinghole 42 of the osteotomy guide block 40. Specifically, the step S1includes:

Step SB1: inserting the detection end 101 of the detection element 100into the guiding groove 41 and/or the guiding hole 42 of the osteotomyguide block 40;

Step SB2: obtaining a pose parameter of the inner surface of the guidinggroove 41 and/or the guiding hole 42 of the osteotomy guide block 40 inthe coordinate system of the trackable element according to thedetection element 100.

Please refer to FIG. 7, in some embodiments, the feature portionincludes the guiding groove 41 of the osteotomy guide block 40. Afterthe detection element 100 is inserted into the guiding groove 41 in stepSB1, the step S1 further includes: acquiring a sliding information ofthe detection end 101 of the detection element 100 when the detectionelement 100 slides in the guiding groove 41 along an extending directionof the guiding groove 41.

In the first example of this embodiment, the detection end 101 of thedetection element 100 includes a sharp portion. As shown in FIG. 7, thesharp portion is a cone, and the size of the end of the sharp portionconnected to the positioning target 102 is preferably larger than thesize of the open end of the guiding groove 41. With this configuration,the sharp tip of the sharp portion can extend into the open end of theguiding groove 41, and the rest of the detection element 100 is stuckoutside the open end of the guiding groove 41. The sharp portion of thedetection end 101 is placed at the open end of the guiding groove 41,and then the detection end 101 slides in the guiding groove 41 along theextending direction of the guiding groove 41. The navigation device 6can obtain the pose parameter of the open end of the guiding groove 41by the positioning target 102. If the open end of the guiding groove 41is distorted or deformed, it can be detected by the sliding of thedetection element 100. In practice, each guiding groove 41 includes twoopen ends, so in practice it is necessary to obtain an information abouta single sliding of the detection end 101 of the detection element 100along the extending direction of each guiding groove 41 to obtain thepose parameter of the inner surface of each guiding groove 41 at the twoopen ends, respectively. In an embodiment, the osteotomy guide block 40includes six guiding grooves 41. Each guiding groove 41 penetrates twoopposite surfaces of the osteotomy guide block 40. So, it needs torespectively detect the twelve open ends of the six guiding grooves 41.Optionally, after the detection element 100 slides along the open endson the same side of all the guiding grooves 41 and then slides along theopen ends on the other side of all the guiding grooves 41. Optionally,in other embodiment, the detection element 100 verifies every twoopposite open ends of each guiding groove 41 in pairs according to apreset sequence, or acquires the pose parameters of the open ends of allguiding grooves 41 with a single sliding. Then each correspondingguiding groove 41 is identified according to the feature pointclassification of all pose parameters.

Further, it is determined in sequence whether the pose parameters of theopposite two open ends of each guiding groove 41 are in the same plane.If the pose parameters of the two open ends of one guiding groove 41 arenot in the same plane, it means that the corresponding guiding groove 41is seriously deformed, which prompts/informs the operator that theosteotomy guide tool 4 has deformed. And if the pose parameters of theopposite two open ends of each guiding groove 41 are in the same plane,and then the pose parameters of the open end of each guiding groove 41are further compared with corresponding standard values. It should beunderstood that the standard value corresponding to the pose parameterof the open end of the guiding groove 41 should be the design valuepreset by the expected pose parameter of the open end of the guidinggroove 41, such as the design value preset at the factory. If the offsetobtained by comparing the pose parameter of the open end of the guidinggroove 41 with the corresponding standard value is greater than theexpected value, it means that the deformation of the guiding groove 41is large, that is, the osteotomy guide tool 4 is deformed, and theoperator can replace or perform other treatments on the deformedosteotomy guide tool 4 according to the actual situation. Further, ifthe offset is not greater than the expected value, and the operator canfurther choose whether to update the standard value as the poseparameter value of the open end of the guiding groove 41 actuallyobtained in step S1, so as to perform the surgical operation moreaccurately in the subsequent period.

Please refer to FIG. 8, in the second example of this embodiment, thedetection end 101 of the detection element 100 includes a plunger whosewidth matches the width of the guiding groove 41 of the osteotomy guideblock 40 of the osteotomy guide tool 4. The plunger is used to beinserted into the guiding groove 41. As shown in FIG. 7, the plunger hasa width matching with the width of the guiding groove 41, the plungerhas a height preferably not smaller than the depth of the guiding groove41. In this configuration, the plunger can be inserted from the open endof one side of the guiding groove 41 is inserted and extend to the openend of the other side. The plunger forms a full coverage of the entireside wall of the guiding groove 41 in the height direction. In actualuse, the step of acquiring the sliding information of the detection end101 when the detection element 100 slides in the guiding groove 41 alongthe extending direction of the guiding groove 41 includes: acquiring asliding information of the detection end 101 of the detection element100 along the extending direction of each of the guiding grooves 41 toobtain a pose parameter of the inner surface of each of the guidinggrooves 41. In practice, after inserting the plunger into the guidinggroove 41, the plunger slowly moves from one end to the other end alongthe extending direction of the guiding groove 41. In this configuration,the two inner surfaces of one guiding groove 41 can be obtained in asingle calibration. Other structures and principles of the example aresimilar to the first example of this embodiment, and reference may bemade to the description of the first example of this embodiment. Itshould be noted that, if the plunger cannot be inserted into the guidinggroove 41, it means that the guiding groove 41 has been deformed. Thepose parameter of the feature portion of the osteotomy guide tool 4 inthe coordinate system of the trackable element cannot be obtained. Atthis time, the offset between the pose parameter of the feature portionand the corresponding standard value can be directly determined to begreater than the expected value, and the osteotomy guide tool 4 isdetermined as deformed. In other examples, the detection end 101 of thedetection element 100 includes more than two plungers. The distributionof more than two plungers is consistent with the distribution of theguiding grooves 41 of the osteotomy guide block 40, and all the guidinggrooves 41 have the same length in the extending direction. In this way,all the plungers can be inserted into the corresponding guiding grooves41 and slide at the same time, so that the pose parameters of more thantwo guiding grooves 41 can be obtained by single one slide. Referring toFIG. 9, in the third example of this embodiment, the detection end 101of the detection element 100 includes a sheet portion, the length of thesheet portion matches with the length the guiding groove of theosteotomy guide block of the osteotomy guide tool. As shown in FIG. 9,the osteotomy guide block 40 includes three linear guiding groove 41,the three guiding grooves 41 have different lengths. Correspondingly,the lengths of the three sheet portions match with the lengths of thethree guiding grooves 41, respectively. Optional, the detection end 101of detection element 100 is detachably connected to the positioningtarget 102. With such a configuration, in a verification process,different sheet portions can be replaced according to the differentguiding grooves 41 to be verified, and it is only necessary to performonce calibration to the detection target 100. It can be understood thatin some other embodiments, the number of guiding grooves 41 is notlimited to three, and the shape is not limited to a straight line, aslong as the number and shape of the sheet portions correspond to theguiding groove 41. In actual use, after the sheet portion to be insertedis inserted into the guiding groove 41, the pose parameters of theguiding groove 41 can be obtained. In other examples, the detection end101 of the detection element 100 includes more than two sheet portions,and the distribution of more than two sheet portions is consistent withthe distribution of the guiding groove 41 of the osteotomy guide block40, that is, all sheet portions can be inserted into the correspondingguiding grooves 41 at the same time, so as to obtain the pose parametersof more than two guiding grooves 41 at the same time. Other structuresand principles of the example are similar to the first example of thisembodiment, and reference may be made to the description of the firstexample of this embodiment.

Please refer to FIG. 10, in the fourth example of this embodiment, thedetection end 101 of the detection element 100 includes a pin whoseouter dimension matches with the inner dimension of the guiding hole 42of the osteotomy guide block 40 of the osteotomy guide tool 4. As shownin FIG. 10, the guiding hole 42 is a round hole, and the pin is in acylindrical shape. The outer diameter of the pin matches with the innerdiameter of the guiding hole 42. The guiding hole 42 is a through holeand the pin has an axial length not smaller than the depth of theguiding hole 42. In this configuration, the pin can be inserted from theopen end of one side of the guiding hole 42 and extend to the open endof the other side, and the pin forms an overall coverage to the entireguiding hole 42 in the axial direction. In actual use, after insertingthe pin into the guiding hole 42, the pose parameter of the guiding hole42 can be obtained. Optionally, the pin is detachably connected to thepositioning target 102. In this configuration, when the osteotomy guideblock 40 includes multiple guiding holes 42 of different specificationsor both guiding holes 42 and guiding grooves 41 at the same time, thepins of different specifications can be removed and replaced by pins ofdifferent specifications, or by removing and replacing the pins and thesheet portion. In the verification process, the detection element 100only needs to be calibrated once. In other example, the detection end101 of the detection element 100 includes more than two pins, and thedistribution of more than two pins is consistent with the distributionof the osteotomy guide block 40 of the guiding holes 42, that is, allpins can be simultaneously inserted into the corresponding guiding holes42 to obtain the pose parameters of the more than two guiding holes 42at the same time. Other structures and principles of the example aresimilar to the first example of this embodiment, and reference may bemade to the description of the first example of this embodiment.

Please refer to FIG. 11 and FIG. 12, in the fifth example of thisembodiment, the pins are triangular, and in the sixth example of thisembodiment, the pins are rectangular. When the guiding hole 42 iscircular, in addition to the cylindrical shape as described in thefourth example of this embodiment, the cross section of the pin can alsobe a polygon with a circumscribed circle whose diameter is the innerdiameter of the guiding hole 42. The pin is not limited to a triangularprism shape or a quadrangular prism shape, but can also be otherpolygonal prisms, and the guiding hole 42 is not limited to a roundhole, in some embodiments, the guiding hole 42 is designed with a shapethat matches with the outer contour of the pin. For example, when thepin is triangular prism-shaped, the guiding hole 42 may be triangular orhexagonal, those skilled in the art can configure the pin and theguiding hole 42 according to the above descriptions. Same as the fourthexample of this embodiment, the pins in the fifth example and the sixthexample of this embodiment are also detachably connected with thepositioning target 102.

Referring to FIG. 13, in a seventh example of this embodiment, thedetection end 101 includes both a sheet portion and a pin, and thelength of the sheet portion matches with the length of the guidinggroove 41 of the osteotomy guide block 40 of the osteotomy guide tool 4,and the outer diameter of the pin matches with the inner diameter of theguiding hole 42 of the osteotomy guide block 40 of the osteotomy guidetool 4. As shown in FIG. 13, the osteotomy guide block 40 includes threelinear guiding groove 41 and multiple guiding holes 42. Correspondingly,the detection end 101 includes three sheet portions and multiple pins atthe same time, and the distribution of three sheet portions and multiplepins is consistent with the distribution of the guiding groove 41 andthe guiding hole 42 of the osteotomy guide block 40. With thisconfiguration, all sheet portions and pins can be inserted into thecorresponding guiding groove 41 and guiding hole 42 at the same time,and the pose parameters of all the guiding groove 41 and guiding hole 42can be obtained at once. Other structures and principles of the exampleare similar to the first example of this embodiment, and reference maybe made to the description of the first example of this embodiment. Itshould also be noted that in the third example to the seventh example ofthis embodiment, if a sheet portion or any one of the pins cannot beinserted into the corresponding guiding groove 41 and the guiding hole42, it means that the guiding groove 41 or the guiding hole 42 has beendeformed. The pose parameter of the feature portion of the osteotomyguide tool 4 in the coordinate system of the trackable element cannot beobtained. At this time, the offset between the pose parameter of thefeature portion and the corresponding standard value can be directlydetermined to be greater than the expected value, and the osteotomyguide tool 4 is determined as deformed.

In the second embodiment, the verification method of the osteotomy guidetool, the verification system and the detection element are provided. Anoffset is obtained by obtaining the pose parameters of the inner surfaceof the guiding groove 41 and/or the guiding hole 42 of the osteotomyguide block 40, and comparing the obtained pose parameters with thecorresponding standard value. If the offset is greater than the expectedvalue, the osteotomy guide tool 4 is determined as deformed. With thisconfiguration, the guiding groove 41 and/or the guiding hole 42 of theosteotomy guide block 40 of the osteotomy guide tool 4 can be verifiedto avoid the deformation of the guiding groove 41 and/or the guidinghole 42 due to the repeated use or transportation of the osteotomy guidetool 4, thereby affecting its positioning accuracy and affects surgery.

Embodiment 3

Please refer to FIG. 14, which is a schematic diagram of a verificationsystem for an osteotomy guide tool provided in Embodiment 3 of thepresent disclosure.

The verification method of the osteotomy guide tool, the verificationsystem and the detection element provided by the third embodiment of thepresent disclosure are basically the same as the verification method ofthe osteotomy guide tool, the verification system and the detectionelement provided by the first embodiment. For the same part is notdescribed, only the differences will be described below.

As shown in FIG. 14, the difference from the first embodiment is that inthis embodiment, the verification system of the osteotomy guide toolonly includes an osteotomy guide tool 4, a trackable element 3, anavigation device 6 and a control device, the verification system doesnot include the detection element 100. The osteotomy guide tool isarranged at the end of a robotic arm 2. The feature portion includes thegeometric center point of the osteotomy guide block 40.

In this embodiment, the step S1 of the verification method of theosteotomy guide tool includes:

Step SC1: driving the osteotomy guide tool 4 by the robotic arm 2 torotate around a preset geometric center point of the osteotomy guideblock 40. The coordinates of the preset geometric center point in thecoordinate system of the robotic arm can be determined by athree-coordinate calibration instrument at the factory or obtained fromthe design value of the osteotomy guide tool 4.

Step SC2: calculating a pose parameter of the geometric center point ofthe osteotomy guide block 40 in the coordinate system of the trackableelement based on a point cloud information formed by the trackableelement 3 connected to the osteotomy guide tool 4 during rotation. Thecontrol device can obtain the rotation trajectory of the tool target 3(that is, the cloud information) by the navigation device 6. Throughcalculation, the position of the rotation center of the osteotomy guidetool 4 in the coordinate system of the trackable element can be furtherobtained, that is, the pose parameter of the geometric center point ofthe osteotomy guide block 40 in the coordinate system of the trackableelement is calculated.

Further in the step S2, the obtained pose parameter of the geometriccenter point of the osteotomy guide block 40 of the osteotomy guide tool4 is compared with the corresponding standard value (such as the poseparameters of the geometric center point of the osteotomy guide block 40determined by the three-coordinate calibration instrument in thecoordinate system of the trackable element) to obtain the offset betweenthe pose parameter of the geometric center point of the osteotomy guideblock 40 of the osteotomy guide tool 4 and the standard value. If theoffset is greater than the expected value, the osteotomy guide tool 4 isdetermined as deformed. After the step of comparing between the offsetand the expected value, further operations and methods are described asthose in Embodiment 1, which will not be described in this embodiment.

Through the verification method of the osteotomy guide tool provided inthis embodiment, the geometric center point of the osteotomy guide block40 of the osteotomy guide tool 4 in the coordinate system of the roboticarm can be calculated by means of the movement trajectory, which can beverified by using the structure detected by the detection element 100 inanother embodiment.

Optionally, in the step SC1, the connection points between the roboticarm 2 and the osteotomy guide tool 4 are taken as the movement points,the movement points each follows a circular movement around a movementcenter in a movement plane, wherein an angle between: i) a movement linedefined by connecting any one of the movement points and the presetgeometric center point and ii) a center line defined by connecting themovement center and the preset geometric center point is not smallerthan 30°. For a further description, the movement mode of the roboticarm 2 driving the osteotomy guide tool 4 is abstracted. The connectionpoint between the robotic arm 2 and the osteotomy guide tool 4 is takenas a movement point, and the trajectory of the movement point canactually be spherical around the preset geometric center point. In orderto improve the accuracy of calculating the rotation center, the roboticarm 2 can be configured to drive the osteotomy guide tool 4 to rotatearound a rotation axis passing through a preset geometric center point,and the movement point moves in a circular motion around a movementcenter on a movement plane. The movement plane is perpendicular to therotation axis, and the movement center is arranged on the rotation axis.The movement line is defined by connecting the movement point and thepreset geometric center point, and the center line is defined byconnecting the movement center and the preset geometric center point,here, the angle between the limited movement line and the center line isnot smaller than 30°. The accuracy of calculating the rotation centerpoint can be improved. It can be understood that when the robotic arm 2drives the osteotomy guide tool 4 to rotate around a rotation axispassing through the preset geometric center point, the movement pointand the preset geometric center point actually appear as a cone. Whenthe vertex angle of the cone is too small, the accuracy of thecalculated rotation center is low.

It should be noted that the embodiments in this specification aredescribed in a progressive manner. Each embodiment focuses on thedifferences from other embodiments. The same and similar parts betweenthe embodiments can be referred to each other. In addition, thedifferent parts between the various embodiments can also be used incombination with each other, which is not limited in the presentdisclosure.

In summary, the verification method of the osteotomy guide tool, theverification system and the detection element according to the presentdisclosure relate: first obtaining a pose parameter of a feature portionof an osteotomy guide tool in a coordinate system of a trackableelement; then comparing the obtained pose parameter of the featureportion of the osteotomy guide tool with a corresponding standard valueto obtain an offset between the pose parameter of the feature portion ofthe osteotomy guide tool and the standard value; if the offset isgreater than an expected value, the osteotomy guide tool is determinedas deformed. With this configuration, the osteotomy guide tool can beverified to avoid deformation of the osteotomy guide tool duringrepeated use or transportation, affecting its positioning accuracy andaffecting the operation.

The above description is only a description of the embodiments of thepresent invention, and does not limit the scope of the presentinvention. Any changes or modifications made by those skilled in the artaccording to the above disclosure shall fall within the protection scopeof the claims.

What is claimed is:
 1. A detection element for verifying an osteotomyguide tool, comprising: a detection end for contacting a feature portionof the osteotomy guide tool; and a positioning target connected to thedetection end and configured to provide a pose parameter of the featureportion of the osteotomy guide tool in a coordinate system of atrackable element.
 2. The detection element of claim 1, wherein thedetection end comprises a sharp portion for abutting the feature portionof the osteotomy guide tool.
 3. The detection element of claim 2,wherein the feature portion comprises a guiding groove of an osteotomyguide block, and wherein a sharp tip of the sharp portion is able toextend into an open end of the guiding groove.
 4. The detection elementof claim 3, wherein the sharp portion is a cone, and wherein the size ofan end of the sharp portion connected to the positioning target islarger than the size of the open end of the guiding groove.
 5. Thedetection element of claim 1, wherein the detection end comprises aplunger having a width matching with a width of a guiding groove of anosteotomy guide block of the osteotomy guide tool, and wherein theplunger is configured to be inserted into the guiding groove.
 6. Thedetection element of claim 1, wherein the detection end comprises asheet portion having a length matching with a length of a guiding grooveof an osteotomy guide block of the osteotomy guide tool and/or a pinhaving an outer dimension matching with an inner dimension of a guidinghole of the osteotomy guide block of the osteotomy guide tool.
 7. Thedetection element of claim 1, wherein the detection end is detachablyconnected to the positioning target.
 8. A verification system,comprising: an osteotomy guide tool comprising an osteotomy guide blockand a target mounting portion connected with the osteotomy guide block;a detection element for verifying the osteotomy guide tool, comprising:a detection end for contacting a feature portion of the osteotomy guidetool; and a positioning target connected to the detection end andconfigured to provide a pose parameter of the feature portion of theosteotomy guide tool in a coordinate system of a trackable element; thetrackable element provided on the target mounting portion; a navigationdevice configured to communicate with the trackable element and thedetection element, thereby obtaining a pose parameter of the trackableelement and the detection element by the positioning target; and acontrol device in communication with the navigation device; wherein thedetection end of the detection element is configured to contact thefeature portion of the osteotomy guide tool, wherein the control deviceis configured to obtain the pose parameter of the feature portion in thecoordinate system of the trackable element by the navigation device andthe detection element, and wherein if an offset between the obtainedpose parameter and a corresponding standard value is greater than anexpected value, the osteotomy guide tool is determined as deformed. 9.The verification system of claim 8, wherein the detection end of thedetection element comprises a sharp portion for abutting the featureportion of the osteotomy guide tool.
 10. The verification system ofclaim 9, wherein the feature portion comprises a guiding groove of anosteotomy guide block, and wherein a sharp tip of the sharp portion isable to extend into an open end of the guiding groove.
 11. Theverification system of claim 10, wherein the sharp portion is a cone,and wherein the size of an end of the sharp portion connected to thepositioning target is larger than the size of the open end of theguiding groove.
 12. The verification system of claim 11, wherein thenavigation device is configured to obtain the pose parameter of the openend of the guiding groove by the positioning target.
 13. Theverification system of claim 8, wherein the detection end of thedetection element comprises a plunger having a width matching with awidth of a guiding groove of an osteotomy guide block of the osteotomyguide tool, and wherein the plunger is configured to be inserted intothe guiding groove.
 14. The verification system of claim 8, wherein thedetection end of the detection element comprises a sheet portion havinga length matching with a length of a guiding groove of an osteotomyguide block of the osteotomy guide tool and/or a pin having an outerdimension matching with an inner dimension of a guiding hole of theosteotomy guide block of the osteotomy guide tool.
 15. The verificationsystem of claim 8, wherein the detection end is detachably connected tothe positioning target.